CA1047416A - Lubricating means for gas-operated cylinders - Google Patents

Lubricating means for gas-operated cylinders

Info

Publication number
CA1047416A
CA1047416A CA284,796A CA284796A CA1047416A CA 1047416 A CA1047416 A CA 1047416A CA 284796 A CA284796 A CA 284796A CA 1047416 A CA1047416 A CA 1047416A
Authority
CA
Canada
Prior art keywords
piston
chamber
lubricant
cylinder
set forth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA284,796A
Other languages
French (fr)
Inventor
Bernard J. Wallis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of CA1047416A publication Critical patent/CA1047416A/en
Expired legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32Details
    • F16F9/3278Details for lubrication
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32Details
    • F16F9/36Special sealings, including sealings or guides for piston-rods
    • F16F9/362Combination of sealing and guide arrangements for piston rods
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16NLUBRICATING
    • F16N1/00Constructional modifications of parts of machines or apparatus for the purpose of lubrication
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16NLUBRICATING
    • F16N7/00Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • F16N7/12Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated with feed by capillary action, e.g. by wicks

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compressor (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

LUBRICATING MEANS FOR
GAS-OPERATED CYLINDERS

Abstract of the Disclosure In a gas-operated cylinder, the surfaces of the cylinder and piston that are in sliding contact are lubricated by an oil-impregnated wick disposed in an annular chamber at the rod end of the cylinder. The wick extends through radially inwardly extending open-ings in the chamber to contact the piston rod and also through axial openings in the chamber to contact the back side of the piston when the latter moves to the rod end of the cylinder.

Description

.... .
This invention relates to fluid cylinders and, more specifically, to means for lubricating piston-cylinder units of the type operated by gas under pressure in a closed fluid system.
` 5 In metal die forming operations it is common practice to yieldably restrain movement of movable die members by means of fluid springs. Frequently such fluid springs com-prise piston-cylinder units connected to a reservoir of gas under pressure, such as nitrogen. With such closed pres-` 10 sure systems the gas itself does not contain a lubricant, as is the case with systems wherein piston-cylinder units are operated by pressurized air supplied by a compressor and the air lines are equipped with lubricators. Thus, in closed type systems of the type to which the present inven-tion relates in order to reduce wear and minimize service , problems it is desirable to provide auxiliary means to lubricate the surfaces of the cylinder, piston and piston rod which are in sliding contact.
The present invention has for its primary object the provision of a novel lubricating arrangement for such : piston-cylinder units which is of economical construction and which is easily serviceable.
More specifically, the present invention contemplates the provision of a readily accessible chamber at the rod end of a cylinder in which there is arranged a lubricant-.

1.
`

~'--~Q47416 ,~, - impregnated wick having a portion thereof projecting into the idle chamber of the cylinder, that is, the chamber through which the piston rod extends. The wick is also preferably arranged so that it contacts the piston rod.
Thus, with the arrangement of this invention, whenever the piston is reciprocated in the cylinder, the piston rod is lubricated, and, whenever the piston is retracted . . .
: ., in the cylinder to a predetermined position, the back face thereof contacts the portion of the wick projecting into the cylinder which supplies lubricant to the faces , . ~ .
t'`~ of the piston and cylinder which are in sliding contact.
Other objects, features and advantages of the pre-v sent invention will become apparent from the following , description and accompanying drawing, in which:
FIG. 1 is a fragmentary vertical sectional view of a gas-operated piston-cylinder assembly according to the present invention illustrating the manner in which it is used in a die assembly;
';, FIG. 2 is a sectional view along the line 2-2 in ` 20 FIG. l; and :
FIG. 3 is a fragmentary view of a portion of the , arrangement illustrated in FIG. 1 showing the piston at ~ the upper end of its stroke.

:' ,:

" . : : .

-- Referring to FIG. 1, there is illustrated a fluid spring, generally designated 10, in the form of a piston-cylinder unit which, in accordance with the present in-vention, is arranged between a vertically movable die . 5 member 12 and a fixed support 14 which, in the illustrated : arrangement, comprises a manifold plate of a die assembly.
The overall arrangement shown in FIG. 1 is generally simi-lar to that illustrated in my prior Canadian Patent No.
1,022,476, dated December 13, 1977. Piston-cylinder unit 10 comprises a cylinder sleeve 16 which is threaded as at 18 into a bore 20 in a manifold plate 14. A rubber O-ring ;
.;22 seals the threaded connection between sleeve 16 and manifold plate 14. Adjacent the upper end thereof sleeve 16 is formed with an annular chamber 24 which extends ~-15 around the rod 26 of a piston 28 slideably arranged with-in sleeve 16. Piston 28 divides the cylinder into a pressure chamber 27 and an idle chamber 29. A plastic bushing 30 is interposed between the inner wall 32 of chamber 24 and piston rod 26. Bushing 30 is formed with a small axially extending groove 34 in the full length thereof (FIG. 2) for admitting and exhausting air from idle chamber 29 as the piston reciprocates. One end of chamber 24 is defined by an end wall 36 which is common to the idle chamber 29. The opposite end of chamber 24 is defined by a cover 38 which is removably secured to ,.
.~................ the upper end of cylinder sleeve 16 by screws 40. within : chamber 24 there is arranged a wick 42 which is impregnat-. ed with a lubricant, such as oil. wick 42 preferably comprises a fibrous material, such as felt or the like.
, End wall 36 is formed around its outer periphery with a :

;................. plurality of openings 44 through which wick 42 extends .
i., .
.~. as at 46. The impregnated wick 42 is arranged to extend through openings 44 slightly beyond the face of end wall 36. The inner peripheral wall 32 of chamber 24 is like-wise provided with a plurality of radially extending open-",,,; . .
ings 48 which register with pockets 50 around the inner periphery of bushing 30. If desired, pockets 50 can be formed as a circumferentially continuous groove around ~. . .
bushing 30. In either event, the oil-impregnated wick ~, 15 42 extends through openings 48 and into pockets 50.

As pointed out above, piston 28 divides the bore of ".
sleeve 16 into an idle chamber 29 and working chamber 27.
working chamber 27 is open at its lower end and communi-cates with bore 20 in manifold plate 14. A port 56 in bore 20 communicates with a gas reservoir 58 by means of ~,~
,~ a passageway 60. Reservoir 58 is filled with a gas, such ,;, ' as nitrogen, and charged to a predetermined high pressure.

From the above description the operation of the lubricating means disclosed is apparent. When die member 12 is in its uppermost position the free end of piston .'' , . . .
.

; ~

10474~6 .: rod 26 abuts the bottom face of die member 12 and is urged upwardly thereagainst by reason of the gaseous pressure in the working chamber 54 connected to reser-`: voir 58. As die member 12 descends piston 28 is dis-. 5 placed downwardly within sleeve 16 and the lubricant-impregnated wick in pockets 50 contacts and lubricates .' piston rod 26. when the downward pressure on die mem-ber 12 is relieved on the up stroke of the press, the - pressure in chamber 54 urges piston 28 upwardly to a position wherein the back face 62 of the piston is con-....
:~, tacted and lubricated by the projecting portions of the :i , ,.
'~ lubricant-impregnated wick in openings 44.
-; In the drawing die member 12 is illustrated in an ; intermediate position. It is preferred that the verti-15 cal travel of die member 12 is such that the upper end of piston rod 26 is at all times in abutting relation with die member 12 and that the upward travel of die ;
member 12 is limited to a predetermined position wherein the back face 62 of piston 28 just contacts the portion 20 of the impregnated material 42 projecting through the openings 44. In this position the back face 62 of the piston does not actually contact the lower face of end wall 36, but is spaced slightly therefrom. This insures the application of lubricant to the piston on each re-25 traction stroke thereof. Since openings 44 are located ~: 10474~6 .:
around the outer periphery of wall 36, the lubricant is , applied to the piston directly adjacent the outer periph-ery thereof and lubrication of the bore of cylinder 16 ~ -is assured.
, 5 ' s .
"
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:,'' .
.~ . .
' .,~. .

7i, ~'f;,~
: ~ .

:, ' " :
,.~ ' .

~'

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED
AS FOLLOWS:

1.
In combination, a cylinder, a piston in said cylin-der dividing the cylinder into a working chamber and an idle chamber which vary inversely in size in response to reciprocation of the piston within the cylinder, said cylinder having an end wall defining one end of the idle chamber, the other end of the idle chamber being defined by the back face of the piston, means for introducing gas under pressure to the working chamber for displacing the piston to a position adjacent said end wall, means on said cylinder defining a lubricant chamber, lubricant-impregnated wick means in said lubricant chamber, passage-way means extending between said lubricant chamber and said idle chamber, said wick means having a portion there-of extending through said passageway means into said idle chamber at a location axially adjacent said end wall, whereby, when the piston is displaced to a position axially adjacent said end wall, it is contacted by said wick means so as to apply lubricant thereto.

2.
The combination set forth in claim 1 wherein said lubricant chamber is disposed axially outwardly beyond said end wall and said passageway means comprises a plurality of apertures in said end wall.
3.
The combination set forth in claim 2 wherein the piston is provided with a rod extending through said end wall, said lubricant chamber extending around said piston rod.
4.
The combination set forth in claim 2 wherein one end of said lubricant chamber opens in a direction axially outwardly of said cylinder and including a cover plate removably secured on said open end of said lubricant chamber.
5.
The combination set forth in claim 3 wherein said lubricant chamber is provided with a cylindrical wall surrounding said piston rod, said cylindrical wall hav-ing a radially extending aperture therethrough, a portion of said lubricant-empregnated wick means extending through said radially extending aperture and contacting the piston rod.

6.
The combination set forth in claim 2 wherein said apertures are disposed adjacent the outer periphery of said end wall.
7.
The combination set forth in claim 2 including means independent of said lubricant chamber for permitting the flow of air into and out of said idle chamber in response to reciprocation of said piston.
8.
The combination set forth in claim 2 including means for limiting the stroke of the piston in one direction to a position wherein the piston contacts the projecting por-tion of said lubricant-impregnated member.
9.
The combination set forth in claim 8 wherein said limiting means are arranged to prevent contacting engage-ment between the piston and said end wall.
10.
The combination set forth in claim 8 wherein the piston rod projects axially outwardly beyond said cylin-der, said last-mentioned means comprising means engaging the outer edge of the piston rod.
CA284,796A 1976-09-13 1977-08-16 Lubricating means for gas-operated cylinders Expired CA1047416A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/722,863 US4076103A (en) 1976-09-13 1976-09-13 Lubricating means for gas-operated cylinders

Publications (1)

Publication Number Publication Date
CA1047416A true CA1047416A (en) 1979-01-30

Family

ID=24903723

Family Applications (1)

Application Number Title Priority Date Filing Date
CA284,796A Expired CA1047416A (en) 1976-09-13 1977-08-16 Lubricating means for gas-operated cylinders

Country Status (2)

Country Link
US (1) US4076103A (en)
CA (1) CA1047416A (en)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4342448A (en) * 1980-04-04 1982-08-03 Wallis Bernard J Gas-operated cylinder
US4447047A (en) * 1981-01-14 1984-05-08 Di-Dro Systems Inc. Cylinder structure
US4765227A (en) * 1982-05-28 1988-08-23 Teledyne Hyson Die cylinder assembly
DE3616844C2 (en) * 1986-05-17 1995-05-24 Festo Kg Guide and seal arrangement for the piston rod of a piston-cylinder unit
FR2609752B1 (en) * 1987-01-16 1991-03-29 Abg Semca PISTON LUBRICATION DEVICE
US5052278A (en) * 1989-03-27 1991-10-01 C.M. Smillie & Company Fluid cylinder with improved wear rings
CA2055917A1 (en) * 1990-12-14 1992-06-15 Bernard Joseph Wallis Gas die cylinders
US5197718A (en) * 1990-12-14 1993-03-30 Wallis Bernard J Self-contained gas springs interchangeable with coil springs
US5220820A (en) * 1991-10-21 1993-06-22 Teledyne Industries Inc. Apparatus and method for cushioning movement of a member in a press
US5314172A (en) * 1992-05-08 1994-05-24 Wallis Bernard J High pressure die cylinder and manifold system
DE9400669U1 (en) * 1994-01-17 1994-03-24 Iska Wolfgang Katz Verwaltungs-Gmbh, 78083 Dauchingen Gas spring element
US5799532A (en) * 1996-05-21 1998-09-01 Lewis; Ronald O. Fully contained self adjusting nitrogen binder plate
FR2779194B1 (en) * 1998-05-28 2000-08-11 Orflam Ind COMPRESSIBLE FLUID DEVICE
JP2001200810A (en) * 2000-01-17 2001-07-27 Kayaba Ind Co Ltd Hydraulic cylinder
DE10323299B4 (en) * 2003-05-21 2006-03-09 Carl Freudenberg Kg Sealing arrangement on piston rods
DE102010049750B3 (en) * 2010-10-29 2012-01-26 Montanhydraulik Gmbh Relapse Press
WO2014056339A1 (en) * 2012-10-08 2014-04-17 Beijingwest Industries Co., Ltd. A fluid damper assembly with gas cup lubrication chamber
US9702382B2 (en) * 2014-12-16 2017-07-11 World Friendship Co., Ltd. Oil hydraulic cylinder and spindle thereof
JP6209550B2 (en) * 2015-03-20 2017-10-04 Kyb株式会社 Single acting hydraulic cylinder
JP2019015348A (en) * 2017-07-07 2019-01-31 東京エレクトロン株式会社 Gas cylinder
CN108799243B (en) * 2018-06-23 2021-07-30 芜湖通全科技有限公司 Hydraulic device with heat dissipation function
WO2020088936A2 (en) * 2018-10-31 2020-05-07 Bsh Industries Aps An actuator and a bow
US11261886B1 (en) * 2021-06-14 2022-03-01 King Yuan Fu Packaging Co., Ltd. Pneumatic cylinder and mechanical apparatus using the same

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1010498A (en) * 1908-06-10 1911-12-05 William H Hultgren Lubricating device.
US968132A (en) * 1910-03-17 1910-08-23 James J Coyne Oil-bushing and packing-ring.
US1200001A (en) * 1915-07-06 1916-10-03 Heimbach Patents Promotion Co Cushion-swab for cylinders.
US2595878A (en) * 1948-07-03 1952-05-06 John B Parsons Sealing device for piston and cylinder assemblies
US3202411A (en) * 1963-10-11 1965-08-24 Elmer F Heiser Fluid spring system
US3943717A (en) * 1974-01-07 1976-03-16 Caterpillar Tractor Co. Contaminant removal from a hydraulic cylinder
US3947005A (en) * 1974-05-31 1976-03-30 Wallis Bernard J Fluid spring assembly

Also Published As

Publication number Publication date
US4076103A (en) 1978-02-28

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